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Hey there! I work on Flutter for desktop. I'm happy to provide a little background.

We made a decision early on to focus where those of us who work on Flutter could deliver the most value, and for Desktop that meant getting the runtimes and platform integration for each of the desktop OSes in good shape (international text input, accessibility support, rendering performance, etc.) as well as core integrations like the menu bar, file chooser dialogs, etc. These are things that need to land in the runtime itself and are significantly more painful for the community to contribute, or author and publish on pub.dev.

We're working on filling in the gaps for widgets that are part of the Material spec, and I expect the community to make and publish widgets on pub.dev that continue to surprise me; I'm blown away time and time again at the beautiful widgets and the community continues to produce either in packages or as pull requests. You should be able to find community-authored packages for treeview, datagrid, and charting on pub.dev today in the meantime.